From a1ffc47f22a843b75f6d6b9a989abcc825939564 Mon Sep 17 00:00:00 2001 From: Nikos Tsironis Date: Fri, 27 Mar 2020 16:01:11 +0200 Subject: [PATCH] dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions() commit 81d5553d1288c2ec0390f02f84d71ca0f0f9f137 upstream. dm_clone_nr_of_hydrated_regions() returns the number of regions that have been hydrated so far. In order to do so it employs bitmap_weight(). Until now, the return type of dm_clone_nr_of_hydrated_regions() was unsigned long. Because bitmap_weight() returns an int, in case BITS_PER_LONG == 64 and the return value of bitmap_weight() is 2^31 (the maximum allowed number of regions for a device), the result is sign extended from 32 bits to 64 bits and an incorrect value is displayed, in the status output of dm-clone, as the number of hydrated regions. Fix this by having dm_clone_nr_of_hydrated_regions() return an unsigned int. Fixes: 7431b7835f55 ("dm: add clone target") Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Nikos Tsironis Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-clone-metadata.c | 2 +- drivers/md/dm-clone-metadata.h | 2 +- drivers/md/dm-clone-target.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-clone-metadata.c b/drivers/md/dm-clone-metadata.c index 54e4fdd607e1..2460cc6e0ef1 100644 --- a/drivers/md/dm-clone-metadata.c +++ b/drivers/md/dm-clone-metadata.c @@ -656,7 +656,7 @@ bool dm_clone_is_range_hydrated(struct dm_clone_metadata *cmd, return (bit >= (start + nr_regions)); } -unsigned long dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd) +unsigned int dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd) { return bitmap_weight(cmd->region_map, cmd->nr_regions); } diff --git a/drivers/md/dm-clone-metadata.h b/drivers/md/dm-clone-metadata.h index c7848c49aef8..6a217f5ea98c 100644 --- a/drivers/md/dm-clone-metadata.h +++ b/drivers/md/dm-clone-metadata.h @@ -154,7 +154,7 @@ bool dm_clone_is_range_hydrated(struct dm_clone_metadata *cmd, /* * Returns the number of hydrated regions. */ -unsigned long dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd); +unsigned int dm_clone_nr_of_hydrated_regions(struct dm_clone_metadata *cmd); /* * Returns the first unhydrated region with region_nr >= @start diff --git a/drivers/md/dm-clone-target.c b/drivers/md/dm-clone-target.c index e9d405e9a5bd..2addf611ef3d 100644 --- a/drivers/md/dm-clone-target.c +++ b/drivers/md/dm-clone-target.c @@ -1455,7 +1455,7 @@ static void clone_status(struct dm_target *ti, status_type_t type, goto error; } - DMEMIT("%u %llu/%llu %llu %lu/%lu %u ", + DMEMIT("%u %llu/%llu %llu %u/%lu %u ", DM_CLONE_METADATA_BLOCK_SIZE, (unsigned long long)(nr_metadata_blocks - nr_free_metadata_blocks), (unsigned long long)nr_metadata_blocks, -- 2.34.1